Filtering and routing of fragmented datagrams in a data network

Details Filtering and routing of fragmented datagrams in a data network Filtering and routing of fragmented datagrams in a data network

H - Electricity

04

L

H04L 12/56 (2006.01) H04L 29/06 (2006.01)

Patent

CA 2572060

Techniques to efficiently filter fragmented datagrams and route fragments are described. For each fragmented datagram, a filtering node obtains filter parameters as fragments for the datagram are received. When all filter parameters are available, the node applies one or more filters on the filter parameters to obtain a filter result for the datagram and stores the filter result in an entry in a routing table. Prior to obtaining the filter result, the node stores all fragments received for the datagram in a memory. When the filter result becomes available, the node processes all fragments already received for the datagram in accordance with the filter result. As each remaining fragment for the datagram is received, the node immediately processes the fragment in accordance with the filter result. When the last fragment is received, the node clears the memory and the routing table entry for the datagram.

L'invention concerne des techniques de filtrage efficace de datagrammes fragmentés et d'acheminement efficace de fragments. Pour chaque datagramme fragmenté, un noeud de filtrage se procure des paramètres de filtrage à mesure que des fragments correspondant au datagramme sont reçus. Lorsque tous les paramètres en question sont disponibles, le noeud applique un ou plusieurs filtres aux paramètres pour dégager un résultat de filtrage correspondant au datagramme et enregistre le résultat dans une entrée de table d'acheminement. Avant de dégager le résultat, ce noeud enregistre tous les fragments reçus pour le datagramme considéré dans une mémoire. Lorsque le résulta de filtrage est dégagé, le noeud traite tous les fragments déjà reçus pour ledit datagramme selon le résultat de filtrage établi. A mesure que l'on reçoit chaque fragment restant pour ce datagramme, le noeud traite immédiatement le fragment selon le résultat en question. Lorsque le dernier fragment est reçu, le noeud libère la mémoire et l'entrée de table d'acheminement pour le datagramme.

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